One base angle of an isosceles triangle measures 50°. What is the number of degrees in the vertex angle?

1 Answer
Nov 21, 2015



In an isosceles triangle, the base angles have the same degree measure and are, as a result, equal. Also the sum of the interior angles of any triangles is 180°, therefore in this case:

Measure of vertex angle in degrees:# = 180 - 2*50 = 180-100=80#